TY - JOUR
T1 - Molecular properties of liquid crystals in the terahertz frequency range
AU - Vieweg, Nico
AU - Jansen, Christian
AU - Shakfa, Mohammad Khaled
AU - Scheller, Maik
AU - Krumbholz, Norman
AU - Wilk, Rafat
AU - Mikulics, Martin
AU - Koch, Martin
PY - 2010/3/15
Y1 - 2010/3/15
N2 - We report on a first experimental study of the molecular properties of nematic liquid crystals in the terahertz range. In the beginning, we extract the frequency and temperature dependent refractive index and absorption coefficient of the cyanobiphenyls 5CB, 6CB and 7CB from terahertz time domain spectroscopy measurements and investigate the impact of the alkyl chain length on the macroscopic liquid crystal characteristics, focusing especially on the pronounced odd and even effect. Next, we deduce the principle polarizabilities and the order parameter S by applying Vuks' approximation and Haller's approach, On this basis, we calculate the main polarizabilities along the longitudinal and transverse axis and link the observed terahertz properties to the molecular structure of the liquid crystals.
AB - We report on a first experimental study of the molecular properties of nematic liquid crystals in the terahertz range. In the beginning, we extract the frequency and temperature dependent refractive index and absorption coefficient of the cyanobiphenyls 5CB, 6CB and 7CB from terahertz time domain spectroscopy measurements and investigate the impact of the alkyl chain length on the macroscopic liquid crystal characteristics, focusing especially on the pronounced odd and even effect. Next, we deduce the principle polarizabilities and the order parameter S by applying Vuks' approximation and Haller's approach, On this basis, we calculate the main polarizabilities along the longitudinal and transverse axis and link the observed terahertz properties to the molecular structure of the liquid crystals.
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U2 - 10.1364/OE.18.006097
DO - 10.1364/OE.18.006097
M3 - Article
C2 - 20389631
AN - SCOPUS:77949576001
SN - 1094-4087
VL - 18
SP - 6097
EP - 6107
JO - Optics Express
JF - Optics Express
IS - 6
ER -